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Effect of Starvation on Amylase and Trypsin Activities at Two Developmental Stages of Artemia (San Francisco)

  • J. F. Samain
  • J. Moal
  • J. Y. Daniel
  • J. R. Le Coz
Part of the NATO ASI Series book series (NSSA, volume 174)

Abstract

An apparent repressive control of amylase and trypsin respectively by starch and proteins of the diet were precedently demonstrated on artificial axenic media [1]. Such a mechanism has been improved also on Artemia fed Platymonas sueccica in more usual rearing conditions. Artemia face a starvation period of 4–5 days during growth or at adult stage by increasing enzymatic activities when food was lacking. This compensatory mechanism was immediate for amylase but was delayed for trypsin depending on the duration of starvation and the decrease of internal protein content. This response time difference is hypothesized to be related to differences in circulating carbohydrates, proteins or amino acid pools in the hemolymph.

These results corroborate observations using artificial axenic media. They suggest that digestive enzyme synthesis is mediated through circulating carbohydrates, proteins or amino acids by a neuroendocrine system. They improve the compensatory model presently proposed and its use as a tool in nutritional requirement studies.

Keywords

Public Health Enzymatic Activity Developmental Stage Molecular Biology Compensatory Mechanism 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    J. F. Samain, A. Hernandorena, J. Moal, J. Y. Daniel and J. R. Le Coz, Amylase and trypsin activities during Artemia development on artifical axenic media: effect of starvation on specific deletions, J. Exp. Mar. Biol. Ecol. 86:255 (1985).CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • J. F. Samain
    • 1
  • J. Moal
    • 1
  • J. Y. Daniel
    • 1
  • J. R. Le Coz
    • 1
  1. 1.IFREMER DRV/PAPlouzaneFrance

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